Microwave oven



FIG. 1 is a front perspective view of a microwave oven showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left-side view thereof;

FIG. 5 is a right-side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines are directed to environment and form no part of the claimed design. The unshaded surfaces that directly adjoin the claimed solid line edge form no part of the claimed design. 

CLAIM We claim the ornamental design for a microwave oven, as shown and described. 